On 12/02/2015 11:47, Wout Mertens wrote:
the Nix store can be optimised by hard-linking files with the same
contents together, so they are only stored once. This is done by
reading all the files in your store, calculating their checksums and
linking them to /nix/store/.links/*[checksum]*. This is especially
useful in Nix where differing build inputs for a package end up with
many of the same files.
Nix 1.8 has a few optimizations that make this operation very fast if
you run it multiple times. Nix also has the auto-optimise-store
setting, which will link new files added to the store. If your store
was optimised, it stays optimised.
I feel this optimisation should be turned on by default but there were
some regressions in the past which is why it wasn't. Therefore I'd
like to ask you to turn on auto-optimise and run optimisation once.
Your disk space and memory footprint will thank you.
...
Please report any issues you encounter, and it would be nice if you
reply to this mail in a while to report that you have encountered no
issues.
I've already been using this for a while. I haven't had any issues while
building, and the space savings are worth it. One thing worth pointing
out is that it makes (or at least seems to make) nix-collect-garbage
need more time to complete.
Cheers,
Harald van Dijk
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